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Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |
Net loss | $ (5,291,869) | $ (7,275,706) | $ (7,839,996)
Other comprehensive loss: |  |  |
Change in unrealized gains (losses) on marketable securities | (9,648) | 2,454 | 9,239
Total comprehensive loss | $ (5,301,517) | $ (7,273,252) | $ (7,830,757)

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